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学科主题: Geochemistry & Geophysics
题名: Intrusion and its implication for subsidence: A case from the Baiyun Sag, on the northern margin of the South China Sea
作者: Shi, XB ; Burov, E ; Leroy, S ; Qiu, XL ; Xia, B
通讯作者: xbshi@scsio.ac.cn
关键词: intrusion ; subsidence ; high velocity layer ; South China Sea
刊名: TECTONOPHYSICS
发表日期: 2005
卷: 407, 期:40545, 页:117-134
收录类别: sci
部门归属: Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Peoples R China; Univ Paris 06, UMR 7072, Lab Tecton, Paris, France; Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China
项目归属: 海洋地质
摘要: We develop a series of simple numerical models to explain the anomalous subsidence and deposition phenomena on the northern continental margin of the South China Sea, in particular in the Baiyun Sag. The results suggest that a short-period high rate deposition of around 17 Ma is related to a rapid subsidence event, which may be due to episodic emplacement of a dense intrusion. Necking and gravity models indicate that in the basement of the Baiyun Sag, there is a dense zone that is 100-200 kg/m(3) more dense than the surrounding country rock. Considering its high magnetic intensity and regional igneous activity, the dense zone is thought to be related to a phase of basalt intrusion that may have taken place around 17 Ma. Thermal and subsidence models indicate that a hot denser intrusion can cause significant subsidence immediately after the intrusion. The subsidence rate then slows down with cooling, thus becoming consistent with the observed subsidence curves at around 17 Ma. The results also indicate that the lithospheric strength under the Baiyun Sag is negligible, and that the high-velocity layer in the lowermost crust may be not an original part of the pre-rift crust. Instead, it is thought to be underplated intrusion emplaced at around 30 Ma when the continental margin broke up. (c) 2005 Elsevier B.V. All rights reserved.
WOS记录号: WOS:000232815100007
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4842
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Shi, XB; Burov, E; Leroy, S; Qiu, XL; Xia, B.Intrusion and its implication for subsidence: A case from the Baiyun Sag, on the northern margin of the South China Sea,TECTONOPHYSICS,2005,407(40545):117-134
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